Finding the Fourth Proportional to 9,359.56, 12,916.74 and 5,381.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,359.56 : 12,916.74 = 5,381.80 : x
2. Step 2: Convert to fraction form
   9,359.56/12,916.74 = 5,381.80/x
3. Step 3: Cross multiply
   9,359.56x = 12,916.74 × 5,381.80
4. Step 4: Simplify right side
   9,359.56x = 69,515,311.33
5. Step 5: Solve for x
   x = 69,515,311.33/9,359.56
6. Step 6: Final answer
   x = 7,427.20